The former Ringer star and his wife — who played Esther on The Vampire Diaries — are expecting their second child, a rep tells PEOPLE exclusively.

Already proud parents to 3½-year-old daughterElla Betsi Janet, the couple are “thrilled” to be expanding their family further, the rep adds.

Gruffudd — who recently guest-starred on Castle and has filmed Forever and Mariah Mundi — certainly seems up for the challenge of two kids; He previously joked that Ella is constantly keeping him on his toes!